Economizer boiler



n 14 1927. 6 E. s. HIGHT ECONOMIZER BOILER Filed Sept. 18, 1924 2Sheets-Sheet l INVENTOR B g W ATTORNEY 14 1927. June E. s. HIGHTECONOMIZER BOILER Filed Sept. 1924 2 Sheets-Shea} 2 ATTORNEY PatentedJune 14, 1927.

' UNITED STATES PATENT OFFICE.

EUGENE S. EIGHT, 01f PEOBIA, ILLINOIS, ASSIGNOR TO POWER SPECIALTYCOMPANY,

OF NEW YORK, N. Y., A CORPORATION 03 NEW YORK.

nconomzrznn Burma.

Application filed September It, 1924. Serial No. 788,431.

- My present invention relates to boilers provided with economizers forutilizing available heat from the heating gases leaving the boilerproper to preheat the boiler feed water, and my invention consists inim- 'provements in economizer construction and arrangement devised withthe general objects in view of improving the 'economizer and combiningit with a boiler so as to produce a convenient, compact, and eflicienteconomizer boiler unit in which the economizer and boiler properco-operate to reduce the external radiation losses from each.

The various features of novelty which characterize my invention arepointed out with particularityin the claims annexed to and forming apart of this specification, but for a better understanding of theinvention, its advantages and specific objects obtained with its use,reference should be had to the accompanying drawings and descriptivematter, in which I have illustrated and described a preferred embodimentof my inventlon.

Of the drawings:

Fig. 1 is a side elevation of an economizer, partly in section on theline 11 of Fig. 2; and

Fig. 2 is a of Fig. 1.

In the drawings I have illustrated my present invention in connectionwith a cross drum horizontal water tube boiler, but it is to beunderstood that the invention is in no wise limited to use-with thisparticular type of boiler. As shown, the water tubes B of theboiler Aare connected at their ends to the usual upper and lower headers B and BThe headers B are connected to the partial sectionon the line 2-2 steamand water drum 0 by horizontal cir-' culator tubes B running along, andjust beneath the top wall A of the boiler housing proper. The headers Bare connected to the drum 0 by the usual nipples B. The heating gasesleave the boiler proper through the outlet A in the to wall of theboiler housing adjacent the rum. A and A represent bafilesdirecting theflow of the heating gases across the water tubes to the outlet A. Fromthe outlet A, the heating fiases pass to theinletE of an economizerthrough an elbow pipe connection D.

The economizer E comprises a bank of horizontally disposed economizertubular ele ments E which are transverse to and directly above theboiler circulator tubes B,

and extend transversely across the path of the heating gases as thelatter flow in a horizontal direction from the economizer inlet E to theeconomizer outlet E. Advam tageously, and as shown, the economizerelements -E are arranged in vertical rows with the elements in adjacentrows staggered with respect to one another. Advantageously also the bankof economizer tubes is vertically shallow and is laterally extended tocover the major portion of the boiler. V

The water to be heated in the economizer enters the latter through avertical inlet header E at the heating gas outlet end of the economizer,and leaves the economizer through a vertical outlet header E adjacentthe economizer heating gas inlet E Advantageously, the elements 111 ineach intermediate vertical row are connected at one side of theeconomizer to the elements E in one adjacent row and at the other sideof the economizer, t0 the elements in the other adjacent row of elementsby return bends E or the like, so that the water flowing from the inletheader E to the outlet header E passes successively through elements Ein rows successively nearer the outlet header. Advantageously, and asshown, the economizer elements E each comprises a bare steel tube d,surrounded by an externally corrugated cast iron casing.

The economizer elements are spaced and supported by tube sheets F and Fat the ends of the economizer, and usually also by one or moreintermediate tube sheets F, of which there are two in the particularconstruction illustrated. As shown, the tube sheet F is formed withsuitably spaced apertures, one for each element E, of a size to receivethe bare ends of the element inner tubes'd, the ends of the elementcasings abut-- ting against the inner face of the tube sheet F. The tubesheet F is formed with apertures, one for each elementE, each largeenough in diameter to receive the casing of the corresponding elementwhich extends throu h this tube sheet. The intermediate tube s eets F'may be identical in construction with the tube sheet F. With this ar-'rangement of the tube sheets, any element E may be removed from theeconomizer, when its ends are disconnected, by moving it axially out ofthe economizer through the tube sheet F. The tube sheets F,-F, and v Fextend through the top and bottom walls of the economizer housing andthose walls are advantageously formed, as shown, by cast metal ribbedplate sections K, each extending between an adjacent pair of tubesheets, to which the section is secured at its opposite ends.

The upper edges of the tube plates F, F, and F are connected to aneconomizer supporting structure above the economizer. As shown, thissupporting structure comprises structural steel cross beams I parallelto and one above each tube sheet and transverse main beams J, to whichthe ends of the beams I are secured. The tube sheets are connected tothe beams I by suspension bolts H as shown, by angle bars F, riveted orotherwise secured to the tube sheets, and transverse angle bar bracketsG secured to the ribs F The bottom wall of the economizer housing properis advantageously spaced above the roof of the boiler thus permittingaccess to the roof wall A of the boiler housing. The space between theeconomizer and the roof of the boiler housing proper is enclosed at oneend by the conduit D, and at the other end by steel plating M, and isenclosed at its sides by steel plating L. The steel plate walls L and Mare preferably covered externally by suitable heat insulating materialP, as are the exposed walls of the conduit D and the econo mizer wallsection plates K at the top of the economizer. The bottom wall of theeconomizer housing and the inner wall D of the conduit D need not beprovided with heat insulating material, however, as the space betweenthe boiler housingproper and the economizer is in effect a dead air heatinsulating space and the economizer and boiler structure each'restrictsheat radiation from the adjacent surface of the other. Advantageously,the return bends E or other end connections are enclosed in a spacebetween the adjacent tube sheet F or F anda metal cover plate Q,supported from the adjacent tube sheet b cast metal wall plates KA whichcloset e edges of the space. Sil-o-cel or like heat insulating andjointpacking material may be packed about the end connections.Advantageously, the economizer isprovided with soot blowingprovisions,inclncling spray pipes R and external cleaning fluid supply, and spraypipe rotating provisions R.

The economizer illustrated is desirably simple and eflective in itsconstruction and in the manner in which it is supported. The arrangementof the economizer relative to the boiler with which it is associatedproduces a compact economizer boiler unit.

Heat radiation losses are satisfactorily minimized, moreover, with areduction in the amount and cost of material otherwise required in theeconomizer and boiler housings. In particular, the roof wall A of theiron reaaaei boiler housing proper can be appreciably lighter in weightand cheaper in construction than would otherwise be required. Theeconomizer boiler unit is characterized also by the short and simpleconnection D between the heating gas outlet of the boiler and theeconomizer inlet E While in accordance with the provisions of thestatutes, I have illustrated and described the best form of my inventionnow known to me, it will be apparent to those skilled in the art thatchanges may be made in the form of the apparatus disclosed withoutdeparting from the spirit of my invention as set forth in the appendedclaims, and that certain features of the invention may sometimes be usedwith advantage without a corresponding useof other features.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In an economizer boiler unit, the combination with a water tubeboiler and its housing having a heating gas outlet at the top of thehousing adjacent one side of the latter ofan economizer locatedabove theboiler and comprising a housing having a heating gas inlet adjacent saidone side of the boiler and a heating gasoutlet adjacent the oppositeside of the boiler and spaced away from the top of the boiler housing toprovide a heat insulating space, a'conduit for passing heating gasesfrom the boiler outlet to the economizer inlet closing one side of saidspace, and heat insulating walls closing the other side of said space. 7

2. In an economizer, the combination with a bankof horizontal economizertubes, of vertical tube sheets through which the economizer tubes pass,supporting means from which the upper ends of said tube sheets aresuspended, and an economizer housing wall connected to and carried bysaid tube sheets.

3. In an economizer, the combination with a bank of horizontaleconomizer tubes of economizer supporting means comprising vertical tubesheets through which the economizer tubes pass and supports from whichthe upper ends of said tube sheets are suspended, and an economizerhousing wall connected to and carried by said tube sheets and formedwith a heating inlet and a heatinggas outlet at the opposite ends of thetube sheets.

4. In an economizer, the combination with a bank of horizontaleconomizer tubes, of economizer supporting means comprising verticaltube sheetsthrough which said tubes extend and supports from which theupper ends of said sheets are sus nded, and cast lates connected to saidvertical plates and ermin the top and bottom walls of the economizerhousing.

5. In an economizer boiler unit, the combination with a boiler having aheating gas outlet at its top, of an economizer located above the boilerand comprising a vertically shallow bank of horizontal economizer tubesand a housing enclosing said tubes and provided with a heating gas inletat one end adjacent said boiler outlet and connected to the latter, andwith a heating gas outlet adjacent the opposite side of the boiler, andmeans connecting the boiler and economizer housings to provide anenclosed heat insu- 1o lat-ing space between the economizer and theboiler extending over a large portion of the latter.

Signed at Peoria, in the county of Peoria,

and State of Illinois, this 9th day of Sep- 15

